One of our favorite bats for an entry level fastpitch player is the 2019 DeMarini Bustos in a drop 13.
Models Overview
Our smaller hitters loved the ultra light swing weight and the smooth smash crated by the two piece design. It is hot out of the wrapper, doesn't require any break in and delivers pop to be useful to the serious, albeit small, fastpitch player. More on this bat in our 2019 DeMarini Bustos Fastpitch Review.
Construction & Technology
The 2019 Bustos is a two piece hybrid bat. That means the handle of the bat is made from a composite material while the barrel is made from aluminum. High end fastpitch bats are often made in the two piece design, but most of the high end ones use both a composite barrel and composite handle. (See the rare exception here).
Performance Comparison

Comparable Bats

Expert Recommendations
In so many ways the Drop 13 DeMarini Bustos Fastpitch bat is the perfect fit for the entry level fastpitch player. A drop 13 swings remarkably light--and with a 2 1/4 barrel you can expect as much bat speed as you can muster. This serves the smaller player well enough. The two piece design helps for hand sting and, in theory at least, increases aggression at the plate.